Nanni T4.155 seriers, Руководство по ремонту

Страница: 148 / 191

60300140 (
indice A
) 4 CYLINDERS WORKSHOP MANUAL 148/191
DISASSEMBLING THE OIL PUMP
(Refer to component part illustration for removal and
reinstallation)
1. REMOVE THE DRIVEN ROTOR.
2. REMOVE THE DISCHARGE VALVE.
Remove the threaded cap, the gasket, the spring and the discharge
valve.
CHECKING THE OIL PUMP
1. CHECK THE DISCHARGE VALVE.
Put engine oil on the discharge valve and verify that it falls normally
under its own weight in the bore.
Replace the discharge valve otherwise. If necessary, replace the
complete oil pump.
2. CHECK THE DRIVING AND DRIVEN ROTORS
A. Check the rotor clearance
Measure the clearance between the driven rotor and the oil pump body
using a set of thickness shims.
Nominal clearance of the rotor type oil pump body:
0.100 – 0.170 mm
Clearance limit of the rotor type oil pump body:
0.20 mm
Replace the rotors if the recorded clearance is greater than the
indicated limit. If necessary, replace the complete oil pump.
B. Verify the reactive clearance at the rotor teeth
end
Measure the reactive clearance at the end of the teething between the
driven and driving rotors using a set of thickness shims.
Nominal reactive clearance at end:
0.060 – 0.160 mm
Reactive clearance limit at end:
0.21 mm
Replace the rotors if the active clearance recorded at the end is greater
than the indicated limit.